EP1590073B1 - Apparatus for mixing - Google Patents
Apparatus for mixing Download PDFInfo
- Publication number
- EP1590073B1 EP1590073B1 EP03776156A EP03776156A EP1590073B1 EP 1590073 B1 EP1590073 B1 EP 1590073B1 EP 03776156 A EP03776156 A EP 03776156A EP 03776156 A EP03776156 A EP 03776156A EP 1590073 B1 EP1590073 B1 EP 1590073B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- flow
- chemical
- rotor shaft
- disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000126 substance Substances 0.000 claims abstract description 62
- 239000000725 suspension Substances 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007844 bleaching agent Substances 0.000 description 5
- 238000004061 bleaching Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3133—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit characterised by the specific design of the injector
- B01F25/31332—Ring, torus, toroidal or coiled configurations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/71—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers
- B01F27/711—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with propellers co-operating with stationary guiding means, e.g. baffles
Definitions
- the present invention relates to an apparatus for mixing of a chemical medium in gas gaseous or liquid state with a pulp suspension.
- Patent EP 664150 discloses an apparatus for this function.
- steam is added which condense and therewith give off its energy content to the pulp suspension.
- a bleaching agent is added in bleaching that shall react with the pulp suspension.
- flotation which means that air shall previously be disintegrated in the pulp suspension such that the hydrophobic ink, or the printing ink, may attach to the rising air bubbles.
- the medium for treatment e.g. air
- the medium for treatment is evenly and homogeneously distributed in the pulp suspension, preferably with tiny bubbles to achieve a large surface against the pulp suspension.
- Another variant is to disintegrate the steam already at the supply in the pulp suspension.
- intermixing of bleaching agent in a pulp suspension relatively large amounts of energy are used in order to provide that the bleaching agent is evenly distributed and conveyed to all the fibres in the pulp suspension.
- the energy requirements are controlled by which bleaching agent that shall be supplied (rate of diffusion and reaction velocity) and also by the phase of the bleaching medium (liquid or gas).
- the geometry at supply of the bleaching agent in vapour phase is important in order to avoid unwanted separation immediately after the intermixture.
- US-A-4,416,548 discloses a mixer having two packages of rings, a movable (rotor) and a stationary (stator), each consisting of a number of rings.
- the object with the apparatus is to create turbulence that causes a good intermixing, by shearing during passage through the flow passages that are formed by the movable and stationary rings.
- the addition of the chemical medium is carried out at a distance from the turbulent flow zone. This results in that any initial distribution of the chemicals is not obtained.
- US-A-5,863,120 discloses an apparatus similar to the above mentioned patent document US-A-4,416,548 , in which the chemical delivery is at a distance from the turbulent flow zone. Accordingly, any initial distribution of the chemicals does not occur.
- the object with the present invention is to provide an apparatus for supplying and intermixing of a chemical medium in a pulp suspension in an effective way and that at least partly eliminates the above mentioned problem.
- the apparatus comprises a housing having a wall that defines a mixing chamber and a first feeder for feeding the pulp suspension to the mixing chamber. Further, the apparatus comprises a rotor shaft, that extends in the mixing chamber, a drive device for rotation of the rotor shaft and a rotor body that is connected to the rotor shaft. The rotor body is arranged to supply kinetic energy to the pulp suspension flow, during rotation of the rotor shaft by the rotation of the drive device, such that turbulence is produced in a turbulent flow zone in the mixing chamber.
- the apparatus also comprises a second feeder for feeding of the chemical medium to the mixing chamber and an outlet for discharging the mixture of chemical medium and pulp suspension from the mixing chamber.
- the apparatus further comprises a flow-restraining disk with one or more flow passages arranged to temporarily increase the flow velocity of the pulp suspension when the pulp suspension passes the flow-restraining disk, the second feeder comprises a chemical distribution element integrated with the rotor body and arranged to distribute the chemical medium to said turbulent flow zone and the rotor body comprises a number of rotor pins, which extends from the rotor shaft on the upstream side of the flow-restraining disk.
- the apparatus comprises a housing with a wall 2 that defines a mixing chamber 4 and a first feeder 6 for supplying of pulp suspension to the mixing chamber. Further, the apparatus comprises a rotor shaft 8, which extends in the mixing chamber 4, a drive device 9 for rotation of the rotor shaft and a rotor body 10 that is connected to the rotor shaft 8. The rotor body is arranged to supply kinetic energy to the pulp suspension flow, during rotation of the rotor shaft by the rotation of the drive device, such that turbulence is produced in a turbulent flow zone 12 in the mixing chamber.
- the apparatus also comprises a second feeder 13 for feeding of the chemical medium to the mixing chamber and an outlet (not shown) for discharging the mixture of chemical medium and pulp suspension from the mixing chamber 4.
- the second feeder 13 comprises a chemical distribution element 14 integrated with the rotor body 10 and arranged to distribute the chemical medium to said turbulent flow zone 12.
- the rotor body 10 comprises a number of rotor pins 11, which extends from the rotor shaft 8.
- the chemical distribution element 14 comprises at least one chemical outlet 16, suitably situated up-stream of the rotor pins.
- a chemical distribution element may comprise of at least one distribution pipe 100 that extends radial from the rotor shaft 102, whereby chemical outlet(s) 104 is arranged on the distribution pipe 100.
- the chemical outlets 104 may be directed (which is shown by the arrows in fig. 4 ) against a rotor pin 106.
- the chemical distribution element may also comprise at least one chemical outlet 104 arranged on at least one of the rotor pins 106.
- the chemical outlet can be directed (as shown by arrows in fig. 2 and 3 ) in the opposite flow direction F of the pulp suspension along the rotor shaft 102, or directed transverse to the flow direction F of the pulp suspension (not shown).
- the chemical distribution element can comprise a plurality of chemical outlets 104 arranged on at least one of the rotor pins 106, whereby at least one chemical outlet 104' is directed in the opposite flow direction of the pulp suspension along the rotor shaft and at least one chemical outlet 104'' is transverse the flow direction of the pulp suspension from the rotor shaft 102.
- the chemical outlets 104 may be designed as cylindrical apertures. Other design, e.g. spray nozzle shape, can be used in order to improve the chemical distribution and prevent the pulp suspension from penetrating upstream in the chemical outlets 104.
- the second feeder 13 may comprise a stationary cylindrical body 18, which is coaxial with the rotor shaft 8, and that the rotor body 10 comprises a sleeve 20 that sealingly surrounds the cylindrical body 18, whereby the cylindrical body is provided with a channel for the chemical medium that communicates with the chemical distribution element 14.
- the second feeder 13 can suitably comprise a connection pipe 22, that extends through the wall 2 of the housing to the stationary cylindrical body 18 and that is connected to the channel therein.
- Fig. 5A-C illustrates that a rotor body 200 according to the present invention comprises a number of rotor pins 202, which extends from the rotor shaft 204 in its radial direction.
- Each rotor pin may be curved forward from the rotor shaft ( fig. 5A ) or backward ( fig. 5B ) relatively to the rotational direction of the rotor body (see arrow in fig. 5A-C ), which both embodiments aims to provide a radial conveyance of the mixture.
- fig. 5A a rotor body 200 according to the present invention comprises a number of rotor pins 202, which extends from the rotor shaft 204 in its radial direction.
- Each rotor pin may be curved forward from the rotor shaft ( fig. 5A ) or backward ( fig. 5B ) relatively to the rotational direction of the rotor body (see arrow in fig. 5A-C ), which both embodiments aims
- each rotor pin may have a width b, as seen in the rotational direction of the rotor body, that increase along at least a part of the rotor body in direction against the rotor shaft 204.
- the embodiment according to fig. 5C decreases the opened area and by that the axial flow velocity increases.
- the rotor pins 202 can be provided with varying cross-sections as illustrate in fig. 6A-D .
- Each rotor pin may be designed with a circular cross-section as shown in fig. 6A , which is simple from a manufacturing viewpoint and a cost efficient design.
- the rotor pins 202 may also be provided with a triangular or quadratic cross-section, according to fig.
- each rotor pin may be designed with a helix shape, suitably with quadratic cross-section, in the axial direction of the rotor pin. Which one of the various designs of the cross-sections of the rotor pins 202 that are most preferable depends on the current flow resistance.
- Fig. 7A-C shows alternative embodiments of a rotor shaft 300 provided with one or more axially flow generating elements 302.
- the axial flow-generating element can comprise a number of blades 304, which are obliquely attached relatively to the rotor shaft. Rotation of the rotor shaft causes an axial flow. If the elements are of various rotational orientations along the rotor shaft as shown in fig. 7A , different directions of flow are obtained as well.
- the axial flow-generating element can comprise a screw thread or a band thread 306, according to alternative embodiments shown in fig.
- the height of the band can suitably be about 5-35 mm.
- the axial flow-generating element can comprise a relatively thin elevation of about 3-6 mm on the surface of the shaft, suitably about 3,8 to 5,9 mm.
- This scale of lengths is suitably when it corresponds to the characteristic size of the fibre-flocks for kraft pulp at current process conditions. Thus, this should be variable in the process.
- the size of the flocks can be said to be in inverse proportion to the total work that is added to the fibre suspension.
- the apparatus comprises a flow-restraining disk 400 with on or more flow passages, preferably having constant axial area, arranged to temporarily increase the flow velocity of the pulp suspension when the pulp suspension passes the flow-restraining disk.
- the purpose of the disk is to create a controller fall of pressure.
- the energy is used for static mixing and the disk is designed for varying pressure recovery depending on desired energy level.
- Fig. 8A-D shows different alternative embodiments of flow passages 402 in the axial direction of a flow-restraining disk 400.
- the flow area A of each flow passage increases or decreases in the direction of the flow, which in particular is shown in fig. 8A-B.
- Fig. 8A shows a divergent opening, i.e. that an open area enlarges in axial direction.
- each flow passage can extend obliquely from the up-stream side of the disk against the centre axis C of the disk.
- the flow-restraining disk 400 is preferably provided with a plurality of flow passages 402 as shown in fig. 9A-C , which passages can be arranged according to a number of alternative placement patterns, radially spread out on the flow-restraining disk.
- the disk is preferably circular or coaxial with the rotor shaft.
- the flow passages of the flow-restraining disk may for example form a Cartesian pattern ( fig. 9A ) which provides asymmetrical jet streams, or a polar pattern ( fig. 9B).
- FIG. 9C shows an alternative embodiment where the flow passages 402 of the flow-restraining disk 400 in axial direction are formed of concentrically rings 404 that are coaxial with a rotor shaft 406, and its rotor body 407, which may comprise one or more rotor pins 408, arranged on distance from and ahead of disk 400.
- the flow-restraining disk is suitably stationary arranged in the housing and the disk may comprise a number of concentrically rings 404, which are coaxial with the rotor shaft 406, and at least one radial bar 410, that fixates the rings 404 relatively each other and that are attached in the wall of the housing, whereby the flow passages 402 are defined by the rings and the bar.
- the flow-restraining disk 400 may also comprise channels 412 for distribution of the chemical medium on the down-stream side of the rotor body, directed in the opposite flow direction F of the pulp suspension.
- channels 412 for distribution of the chemical medium on the down-stream side of the rotor body, directed in the opposite flow direction F of the pulp suspension.
- chemical supply 413 to the channels 412 provided via a radial extending connection pipe 414 in the disk.
- a flow-restraining disk 500 can be integrated with the rotor shaft 502.
- Fig. 10A , C-D illustrates alternative embodiments of flow-restraining disks 500 integrated with the rotor shaft 502.
- the rotor body 504 comprises a number of rotor pins 506, which extends from the rotor shaft 502, whereby the disk is fixed to the rotor pins 506 on the down-stream side of the rotor body as shown in fig. 10A .
- the rotor body may comprise an additional number of pins 506', that extends from the rotor shaft on the down-stream side of the disk, whereby the disk 500 also is fixed to said additional pins 506'.
- the disk comprise a number of concentrically rings 508, which are coaxial with the rotor shaft, and the rotor pins 506, 506' fixates the rings 508 in relation to each other, whereby flow passages 510 are defined by the pins and the rings.
- Fig. 10D shows rotor pins 506 and concentrically rings 500.
- spacer elements 511 are arranged between the rotor pins 506 and the concentrically rings 500. The spacer elements are used in order to move the turbulent zone.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
- The present invention relates to an apparatus for mixing of a chemical medium in gas gaseous or liquid state with a pulp suspension.
- In treatment of pulp suspensions there is a need for intermixture of different mediums for treatment, for example for heating or bleaching purposes. Therefore it is desirable to disperse the medium in the pulp suspension during simultaneous conveyance of the pulp suspension through a pipe. Patent
EP 664150 - In all cases it is hard, with proportionately low addition of energy, to achieve an even intermixture of the medium in the flow of material. When heating pulp suspensions by supply of steam to a pulp pipe, problems often arise with large steam bubbles that are formed on the inside of the pipe, this as a consequence of a non- disintegrated gas with small condensation surface. When these large steam bubbles rapidly implodes, condensation bangs arises that causes vibration in the pipe and in following equipment. This phenomenon limits the amount of steam that can be added to the system and thus the desired increase in temperature. It is hard to achieve a totally even temperature profile in the pulp suspension when large steam bubbles exists. In order to remedy these problems, a large amount of energy can be supplied to carefully admix the steam in the pulp suspension. Another variant is to disintegrate the steam already at the supply in the pulp suspension. In intermixing of bleaching agent in a pulp suspension, relatively large amounts of energy are used in order to provide that the bleaching agent is evenly distributed and conveyed to all the fibres in the pulp suspension. The energy requirements are controlled by which bleaching agent that shall be supplied (rate of diffusion and reaction velocity) and also by the phase of the bleaching medium (liquid or gas). The geometry at supply of the bleaching agent in vapour phase is important in order to avoid unwanted separation immediately after the intermixture.
-
US-A-4,416,548 discloses a mixer having two packages of rings, a movable (rotor) and a stationary (stator), each consisting of a number of rings. The object with the apparatus is to create turbulence that causes a good intermixing, by shearing during passage through the flow passages that are formed by the movable and stationary rings. The addition of the chemical medium is carried out at a distance from the turbulent flow zone. This results in that any initial distribution of the chemicals is not obtained. -
US-A-5,863,120 discloses an apparatus similar to the above mentioned patent documentUS-A-4,416,548 , in which the chemical delivery is at a distance from the turbulent flow zone. Accordingly, any initial distribution of the chemicals does not occur. - The object with the present invention is to provide an apparatus for supplying and intermixing of a chemical medium in a pulp suspension in an effective way and that at least partly eliminates the above mentioned problem.
- This object is achieved with an apparatus for mixing of a chemical medium in gaseous or liquid state with a pulp suspension according to the present invention. The apparatus comprises a housing having a wall that defines a mixing chamber and a first feeder for feeding the pulp suspension to the mixing chamber. Further, the apparatus comprises a rotor shaft, that extends in the mixing chamber, a drive device for rotation of the rotor shaft and a rotor body that is connected to the rotor shaft. The rotor body is arranged to supply kinetic energy to the pulp suspension flow, during rotation of the rotor shaft by the rotation of the drive device, such that turbulence is produced in a turbulent flow zone in the mixing chamber. The apparatus also comprises a second feeder for feeding of the chemical medium to the mixing chamber and an outlet for discharging the mixture of chemical medium and pulp suspension from the mixing chamber. The apparatus further comprises a flow-restraining disk with one or more flow passages arranged to temporarily increase the flow velocity of the pulp suspension when the pulp suspension passes the flow-restraining disk, the second feeder comprises a chemical distribution element integrated with the rotor body and arranged to distribute the chemical medium to said turbulent flow zone and the rotor body comprises a number of rotor pins, which extends from the rotor shaft on the upstream side of the flow-restraining disk.
- In that respect, in accordance with present invention, an even and effective intermixing of the chemical medium in the pulp suspension is provide.
- Further features and advantages according to embodiments of the apparatus according to the present invention are evident from the claims and in the following from the description.
- The present invention shall now be described more in detail in embodiments, with reference to the accompanying drawings, without restricting the interpretation of the invention thereto, where
-
fig. 1A shows an apparatus in cross-section according to an embodiment of the present invention, -
fig. 1B shows a cross-section A-A of the apparatus according tofig. 1A , -
fig. 2 shows a chemical distribution element according to an embodiment, -
fig. 3 shows a chemical distribution element According to an alternative embodiment, -
fig. 4 shows a chemical distribution element according to yet an alternative embodiment, -
fig. 5A-C illustrates different alternative embodiments of rotor pins in cross-section of the rotor shaft, -
fig. 6A-D illustrates different alternative cross-sections of rotor pins, -
fig. 7A-C shows schematically alternative embodiments of a rotor shaft provided with axial flow-generating elements, -
fig. 8A-D shows schematically alternative embodiments of flow passages in an axial direction of a flow-restraining disk, -
fig. 9A-B shows alternative located patterns of flow passages for a flow-restraining disk, -
fig. 9C shows in one embodiment a Flowrestraining disk in axial direction comprising concentrically rings which are coaxial with a rotor shaft, -
fig. 9D shows in a cross-section an embodiment of a flow-restraining disk comprising channels for chemical distribution, -
fig. 9E shows the disk according tofig. 9D in a front view, and -
fig. 10A , C-D illustrates alternative embodiment of flow-restraining disks integrated with the rotor shaft. - In
fig. 1A-B is shown an apparatus according to an embodiment of the present invention, for a mixture of a chemical medium in gas gaseous or liquid state with a pulp suspension. The apparatus comprises a housing with awall 2 that defines amixing chamber 4 and afirst feeder 6 for supplying of pulp suspension to the mixing chamber. Further, the apparatus comprises arotor shaft 8, which extends in themixing chamber 4, adrive device 9 for rotation of the rotor shaft and arotor body 10 that is connected to therotor shaft 8. The rotor body is arranged to supply kinetic energy to the pulp suspension flow, during rotation of the rotor shaft by the rotation of the drive device, such that turbulence is produced in aturbulent flow zone 12 in the mixing chamber. The apparatus also comprises asecond feeder 13 for feeding of the chemical medium to the mixing chamber and an outlet (not shown) for discharging the mixture of chemical medium and pulp suspension from the mixingchamber 4. Thesecond feeder 13 comprises a chemical distribution element 14 integrated with therotor body 10 and arranged to distribute the chemical medium to saidturbulent flow zone 12. - The
rotor body 10 comprises a number of rotor pins 11, which extends from therotor shaft 8. The chemical distribution element 14 comprises at least one chemical outlet 16, suitably situated up-stream of the rotor pins. - As evident from
fig. 2-4 , a chemical distribution element may comprise of at least onedistribution pipe 100 that extends radial from therotor shaft 102, whereby chemical outlet(s) 104 is arranged on thedistribution pipe 100. - As illustrated in
fig, 4 , thechemical outlets 104 may be directed (which is shown by the arrows infig. 4 ) against arotor pin 106. According to an alternative embodiment, as shown infig. 2 and 3 , the chemical distribution element may also comprise at least onechemical outlet 104 arranged on at least one of the rotor pins 106. In that respect, the chemical outlet can be directed (as shown by arrows infig. 2 and 3 ) in the opposite flow direction F of the pulp suspension along therotor shaft 102, or directed transverse to the flow direction F of the pulp suspension (not shown). As evident fromfig. 2 , the chemical distribution element can comprise a plurality ofchemical outlets 104 arranged on at least one of the rotor pins 106, whereby at least onechemical outlet 104' is directed in the opposite flow direction of the pulp suspension along the rotor shaft and at least onechemical outlet 104'' is transverse the flow direction of the pulp suspension from therotor shaft 102. Thechemical outlets 104 may be designed as cylindrical apertures. Other design, e.g. spray nozzle shape, can be used in order to improve the chemical distribution and prevent the pulp suspension from penetrating upstream in thechemical outlets 104. - With reference again to
fig 1A-B , thesecond feeder 13 may comprise a stationary cylindrical body 18, which is coaxial with therotor shaft 8, and that therotor body 10 comprises asleeve 20 that sealingly surrounds the cylindrical body 18, whereby the cylindrical body is provided with a channel for the chemical medium that communicates with the chemical distribution element 14. Thesecond feeder 13 can suitably comprise aconnection pipe 22, that extends through thewall 2 of the housing to the stationary cylindrical body 18 and that is connected to the channel therein. -
Fig. 5A-C illustrates that arotor body 200 according to the present invention comprises a number of rotor pins 202, which extends from therotor shaft 204 in its radial direction. Each rotor pin may be curved forward from the rotor shaft (fig. 5A ) or backward (fig. 5B ) relatively to the rotational direction of the rotor body (see arrow infig. 5A-C ), which both embodiments aims to provide a radial conveyance of the mixture. According to an alternative embodiment shown infig. 5C , each rotor pin may have a width b, as seen in the rotational direction of the rotor body, that increase along at least a part of the rotor body in direction against therotor shaft 204. The embodiment according tofig. 5C decreases the opened area and by that the axial flow velocity increases. The rotor pins 202 can be provided with varying cross-sections as illustrate infig. 6A-D . Each rotor pin may be designed with a circular cross-section as shown infig. 6A , which is simple from a manufacturing viewpoint and a cost efficient design. The rotor pins 202 may also be provided with a triangular or quadratic cross-section, according tofig. 6B-C , which geometry creates a dead air space at rotation of the rotor shaft. According to yet an embodiment the rotor pins may be provided with a shovel-shaped cross-section according tofig. 6D , which results in a sling-effect at rotation of the rotor shaft. In addition, as evident fromfig. 6C , each rotor pin may be designed with a helix shape, suitably with quadratic cross-section, in the axial direction of the rotor pin. Which one of the various designs of the cross-sections of the rotor pins 202 that are most preferable depends on the current flow resistance. -
Fig. 7A-C shows alternative embodiments of arotor shaft 300 provided with one or more axiallyflow generating elements 302. As is shown infig. 7A , the axial flow-generating element can comprise a number ofblades 304, which are obliquely attached relatively to the rotor shaft. Rotation of the rotor shaft causes an axial flow. If the elements are of various rotational orientations along the rotor shaft as shown infig. 7A , different directions of flow are obtained as well. In addition, the axial flow-generating element can comprise a screw thread or aband thread 306, according to alternative embodiments shown infig. 7B-C , which extends along therotor shaft 300, that aims to force the fluid closest to the hub of the rotor shaft towards some direction. For the feeding, the height of the band can suitably be about 5-35 mm. According to an alternative embodiment the axial flow-generating element can comprise a relatively thin elevation of about 3-6 mm on the surface of the shaft, suitably about 3,8 to 5,9 mm. This scale of lengths is suitably when it corresponds to the characteristic size of the fibre-flocks for kraft pulp at current process conditions. Thus, this should be variable in the process. The size of the flocks can be said to be in inverse proportion to the total work that is added to the fibre suspension. - The apparatus comprises a flow-restraining
disk 400 with on or more flow passages, preferably having constant axial area, arranged to temporarily increase the flow velocity of the pulp suspension when the pulp suspension passes the flow-restraining disk. The purpose of the disk is to create a controller fall of pressure. The energy is used for static mixing and the disk is designed for varying pressure recovery depending on desired energy level.Fig. 8A-D shows different alternative embodiments offlow passages 402 in the axial direction of a flow-restrainingdisk 400. The flow area A of each flow passage increases or decreases in the direction of the flow, which in particular is shown infig. 8A-B. Fig. 8A shows a divergent opening, i.e. that an open area enlarges in axial direction.Fig. 8B shows a converging opening, i.e. where the open area diminish in axial direction. As shown infig. 8C-D , each flow passage can extend obliquely from the up-stream side of the disk against the centre axis C of the disk. - The flow-restraining
disk 400 is preferably provided with a plurality offlow passages 402 as shown infig. 9A-C , which passages can be arranged according to a number of alternative placement patterns, radially spread out on the flow-restraining disk. The disk is preferably circular or coaxial with the rotor shaft. The flow passages of the flow-restraining disk may for example form a Cartesian pattern (fig. 9A ) which provides asymmetrical jet streams, or a polar pattern (fig. 9B). Fig. 9C shows an alternative embodiment where theflow passages 402 of the flow-restrainingdisk 400 in axial direction are formed of concentrically rings 404 that are coaxial with a rotor shaft 406, and itsrotor body 407, which may comprise one or more rotor pins 408, arranged on distance from and ahead ofdisk 400. The flow-restraining disk is suitably stationary arranged in the housing and the disk may comprise a number of concentrically rings 404, which are coaxial with the rotor shaft 406, and at least oneradial bar 410, that fixates therings 404 relatively each other and that are attached in the wall of the housing, whereby theflow passages 402 are defined by the rings and the bar. According to an embodiment shown infig. 9D and 9E , the flow-restrainingdisk 400 may also comprisechannels 412 for distribution of the chemical medium on the down-stream side of the rotor body, directed in the opposite flow direction F of the pulp suspension. Suitably ischemical supply 413 to thechannels 412 provided via a radial extendingconnection pipe 414 in the disk. - However, a flow-restraining
disk 500 can be integrated with therotor shaft 502.Fig. 10A , C-D illustrates alternative embodiments of flow-restrainingdisks 500 integrated with therotor shaft 502. Therotor body 504 comprises a number of rotor pins 506, which extends from therotor shaft 502, whereby the disk is fixed to the rotor pins 506 on the down-stream side of the rotor body as shown infig. 10A . As shown infig. 10C , the rotor body may comprise an additional number of pins 506', that extends from the rotor shaft on the down-stream side of the disk, whereby thedisk 500 also is fixed to said additional pins 506'. Preferably, the disk comprise a number of concentrically rings 508, which are coaxial with the rotor shaft, and the rotor pins 506, 506' fixates therings 508 in relation to each other, wherebyflow passages 510 are defined by the pins and the rings.Fig. 10D shows rotor pins 506 and concentrically rings 500. Further,spacer elements 511 are arranged between the rotor pins 506 and the concentrically rings 500. The spacer elements are used in order to move the turbulent zone.
Claims (20)
- Apparatus for mixing of a chemical medium in gaseous or liquid state with a pulp suspension, comprising a housing having a wall (2) that defines a mixing chamber (4), a first feeder (6) for feeding the pulp suspension to the mixing chamber, a rotor shaft (8, 204, 300, 406, 502), that extends in the mixing chamber, a drive device for rotation of the rotor shaft, a rotor body (10, 200, 407, 504), that is connected to the rotor shaft and arranged to supply kinetic energy to the pulp suspension flow, during rotation of the rotor shaft by the rotation of the drive device, such that turbulence is produced in a turbulent flow zone (12) in the mixing chamber, a second feeder (13) for feeding of the chemical medium to the mixing chamber, and an outlet for discharging the mixture of chemical medium and pulp suspension from the mixing chamber, whereby the apparatus comprises a flow-restraining disk (400, 500) with one or more flow passages (402, 510) arranged to temporarily increase the flow velocity of the pulp suspension when the pulp suspension passes the flow-restraining disk, the second feeder (13) comprises a chemical distribution element (14) integrated with the rotor body (10, 200, 504) and arranged to distribute the chemical medium to said turbulent flow zone (12) and the rotor body (10, 200, 407, 504) comprises a number of rotor pins (106, 202, 408, 506), which extends from the rotor shaft (8, 102, 204, 300, 406, 502) on the upstream side of the flow-restraining disk (400, 500).
- apparatus according to claim 1, characterised in that chemical distribution element comprises at least one chemical outlet (16, 104) situated up-stream of the rotor pins (106, 202, 408, 506, 506').
- Apparatus according to claim 2, characterised in that chemical distribution element (14) comprise at least one distribution pipe (100) that extends radial from the rotor shaft (8, 102, 204, 300, 406, 502), whereby the chemical outlet (104) is arranged on the distribution pipe.
- Apparatus according to claim 1, characterised in that the chemical distribution element (14) comprise at least one chemical outlet (104) arranged on at least one of the rotor pins (106, 202, 408, 506, 506').
- Apparatus according to claim 1, characterised in that the chemical distribution element (14) comprise a plurality of chemical outlets (104) arranged on at least one of the rotor pins (106, 202, 408, 506, 506'), whereby at least one chemical outlet (104, 104') is directed in the opposite flow direction (F) of the pulp suspension along the rotor shaft and at least one chemical outlet (104") is directed radial out from the rotor shaft (8, 102, 204, 300, 406, 502).
- Apparatus according to any of claims 2-5, characterised in that the second feeder comprise a stationary cylindrical body (18), which is coaxial with the rotor shaft (8, 102, 204, 300, 406, 502), and that the rotor body (10, 200, 407, 504) comprises a sleeve (20) that sealingly surrounds the cylindrical body, whereby the cylindrical body is provided with a channel for the chemical medium that communicates with the chemical distribution element (14).
- Apparatus according to any of claims 1-6, characterised in that each rotor pin (106, 202, 408, 506, 506') is curved forward from the rotor shaft (8, 102, 204, 300, 406, 502) or backward relatively to the rotational direction of the rotor body (10, 200, 407, 504).
- Apparatus according to any of claims 1-7, characterised in that each rotor pin (106, 202, 408, 506, 506') has a width (b), as seen in the rotational direction of the rotor body (10, 200, 407, 504), that increase along at least a part of the rotor body in direction against the rotor shaft (8, 102, 204, 300, 406, 502).
- Apparatus according to any of claims 1-8, characterised in that the rotor shaft (8, 102, 204, 300, 406, 502) is provided with an axially flow generating element (302).
- Apparatus according to claim 9, characterised in that the axial flow-generating element (302) comprise a number of blades (304), which are obliquely attached relatively to the rotor shaft (8, 102, 204, 300, 406, 502).
- Apparatus according to claim 9, characterised in that the axial flow-generating element (302) comprise a screw thread or a band thread (306), which extends along the rotor shaft (8, 204, 300, 406, 502).
- Apparatus according to claim 1, characterised in that each flow passage (402, 510) extend obliquely from the up-stream side of the disk against the centre shaft (C) of the disk.
- Apparatus according to any of claims 1 or 12,
characterised in that the disk (400, 500) is stationary arranged in the housing. - Apparatus according to claim 13, characterised in that the flow-restraining disk (400) comprise channels (412) for distribution of the chemical medium on the down-stream side of the rotor body.
- Apparatus according to claim 13 or 14, characterised in that the disk (400, 500) comprise a number of concentrically rings (404, 508), which are coaxial with the rotor shaft (8, 102, 204, 300, 406, 502), and at least one radial bar (410), that fixates the rings relatively each other and that are attached in the wall of the housing, whereby the flow passages (402, 510) are defined by the rings and the bar.
- Apparatus according to any of claims 1 or 12, characterised in that the disk (400, 500) is integrated with the rotor shaft (8, 102, 204, 300, 406, 502).
- Apparatus according to claim 16, characterised in that the disk (400, 500) is fixed to the pins on the down-stream side of the rotor body.
- Apparatus according to claim 17, characterised in that the rotor body (10, 200, 407, 504) comprise an additional number of pins (202, 408, 506'), that extends from the rotor shaft (8, 102, 204, 300, 406, 502) on the down-stream side of the disk, whereby the disk (400, 500) is also fixed to said additional pins (106, 202, 408, 506').
- Apparatus according to claim 17 or 18, characterised in that the disk (400, 500) comprise a. number of concentrically rings (404, 508), which are coaxial with the rotor shaft (8, 102, 204, 300, 406, 502), and the rotor pins (106, 202, 408, 506, 506') fixates the rings in relation to each other, whereby flow passages (402, 510) are defined by the pins and the rings.
- Apparatus according to any of claims 16-19, characterised in that spacer elements (511) are arranged between the disk (400, 500) and the rotor pins (106, 202, 408, 506, 506').
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0203677A SE524465E (en) | 2002-12-12 | 2002-12-12 | Apparatus for mixing a gaseous or liquid medium with a pulp suspension |
SE0203677 | 2002-12-12 | ||
PCT/SE2003/001906 WO2004052516A1 (en) | 2002-12-12 | 2003-12-08 | Apparatus for mixing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1590073A1 EP1590073A1 (en) | 2005-11-02 |
EP1590073B1 true EP1590073B1 (en) | 2009-07-29 |
Family
ID=20289838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03776156A Expired - Lifetime EP1590073B1 (en) | 2002-12-12 | 2003-12-08 | Apparatus for mixing |
Country Status (8)
Country | Link |
---|---|
US (1) | US7384184B2 (en) |
EP (1) | EP1590073B1 (en) |
CN (1) | CN100344354C (en) |
AT (1) | ATE437693T1 (en) |
AU (1) | AU2003284824A1 (en) |
DE (1) | DE60328631D1 (en) |
SE (1) | SE524465E (en) |
WO (1) | WO2004052516A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE524466E (en) * | 2002-12-12 | 2007-09-04 | Metso Paper Inc | Apparatus for mixing a gaseous or liquid chemical medium with a pulp suspension |
SE524465E (en) * | 2002-12-12 | 2007-09-04 | Metso Paper Inc | Apparatus for mixing a gaseous or liquid medium with a pulp suspension |
IT201700115299A1 (en) * | 2017-10-12 | 2019-04-12 | Seko Spa | FLOW RECTIFIER AND ITS VENTURI EFFECT MIXER DEVICE |
SE542365C2 (en) * | 2018-10-30 | 2020-04-14 | Valmet Oy | Mixer for mixing chemicals into pulp |
SE542954C2 (en) * | 2019-03-13 | 2020-09-22 | Valmet Oy | Mixer for mixing a gas into pulp comprising a rotor, said rotor comprising a rotor drum |
CN110026100A (en) * | 2019-05-16 | 2019-07-19 | 北京钢元工程技术有限公司 | A kind of fluid uniform mixing device |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE681488A (en) * | 1965-10-25 | 1966-10-31 | ||
SE419603B (en) | 1979-11-27 | 1981-08-17 | Kamyr Ab | APPLICATION FOR MIXING TREATMENT AGENTS IN SUSPENSIONS |
SE445052C (en) | 1980-03-13 | 1987-11-09 | Sunds Defibrator | SET AND DEVICE FOR CONTINUOUS MIXING OF GAS AND / OR LIQUID TREATMENTS IN A MASSAGE SUSPENSION |
US4577974A (en) | 1984-05-04 | 1986-03-25 | Kamyr, Inc. | Medium consistency mixer rotor and stator construction |
AU5586586A (en) * | 1985-07-22 | 1987-02-10 | Weyerhaeuser Co. | Double sided mixer |
US4884943A (en) * | 1987-06-25 | 1989-12-05 | A. Ahlstrom Corporation | Method and apparatus for pumping high-consistency fiber suspension |
US5088831A (en) | 1988-02-09 | 1992-02-18 | Sunds Defibrator Industries Aktiebolag | Device for treating material mixtures |
US4877368A (en) * | 1988-11-08 | 1989-10-31 | A. Ahlstrom Corporation | Fluidizing centrifugal pump |
AT394738B (en) * | 1990-09-03 | 1992-06-10 | Andritz Ag Maschf | METHOD AND DEVICE FOR DISCHARGING A MEDIUM FROM A CONTAINER |
US5263774A (en) * | 1992-03-04 | 1993-11-23 | Kamyr, Inc. | Rotor for increasing mixing efficiency in a medium consistency mixer |
SE501894C2 (en) | 1993-10-13 | 1995-06-12 | Kvaerner Pulping Tech | Method and apparatus for mixing fluid in a pulp suspension |
US5813758A (en) * | 1993-12-10 | 1998-09-29 | Ahlstrom Machinery Inc. | Concentric ring fluidizing mixer |
FI103019B1 (en) * | 1994-01-25 | 1999-04-15 | Ahlstroem Oy | Process and apparatus for mixing a gaseous chemical in a fiber suspension |
SE506435C2 (en) | 1995-04-19 | 1997-12-15 | Kvaerner Pulping Tech | Apparatus for mixing a first fluid into a second fluid |
US5863120A (en) | 1997-01-31 | 1999-01-26 | Beloit Technologies, Inc. | Medium consistency liquid mixture |
SE524465E (en) * | 2002-12-12 | 2007-09-04 | Metso Paper Inc | Apparatus for mixing a gaseous or liquid medium with a pulp suspension |
SE524466E (en) * | 2002-12-12 | 2007-09-04 | Metso Paper Inc | Apparatus for mixing a gaseous or liquid chemical medium with a pulp suspension |
-
2002
- 2002-12-12 SE SE0203677A patent/SE524465E/en not_active IP Right Cessation
-
2003
- 2003-12-08 DE DE60328631T patent/DE60328631D1/en not_active Expired - Fee Related
- 2003-12-08 US US10/537,938 patent/US7384184B2/en not_active Expired - Fee Related
- 2003-12-08 CN CNB2003801057844A patent/CN100344354C/en not_active Expired - Fee Related
- 2003-12-08 EP EP03776156A patent/EP1590073B1/en not_active Expired - Lifetime
- 2003-12-08 AT AT03776156T patent/ATE437693T1/en active
- 2003-12-08 AU AU2003284824A patent/AU2003284824A1/en not_active Abandoned
- 2003-12-08 WO PCT/SE2003/001906 patent/WO2004052516A1/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
ATE437693T1 (en) | 2009-08-15 |
AU2003284824A1 (en) | 2004-06-30 |
SE524465C2 (en) | 2004-08-10 |
WO2004052516A1 (en) | 2004-06-24 |
DE60328631D1 (en) | 2009-09-10 |
US7384184B2 (en) | 2008-06-10 |
CN1726073A (en) | 2006-01-25 |
SE524465E (en) | 2007-09-04 |
CN100344354C (en) | 2007-10-24 |
US20060133195A1 (en) | 2006-06-22 |
EP1590073A1 (en) | 2005-11-02 |
SE0203677D0 (en) | 2002-12-12 |
SE0203677L (en) | 2004-06-13 |
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